i have a very old computer at home, I would like to be able to play online games and mafia wars on myspace, but my computer locks up. do I need a "gaming computer" or just a regular pc? did I mention I am not very computer savy?
Having never played it, I'd say anything that runs through Myspace is probably low power enough to run on anything.
That being said, if you're using something less than a Pentium 3 or 4 you should probably upgrade no matter what as internet content is becoming more demanding. Soon even "basic" sites will start to loose functionality.
If you just want to get a new computer, anything you buy new nowadays will be fine for what you are describing. You certainly do not need anything "gaming-style" for what you are describing.
Now that being said, you can get much better quality and performance if you are willing to build it yourself. You'll find more than enough help here if you want to go that route and feel comfortable doing it.
So to answer your question? A regular PC will be "fine". You can get one of those $300 Dells at Best Buy. Just remember, you get what you pay for. (and don't get a Gateway or Compaq)